An Apple II emulator in JavaScript
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AppleToo is an Apple II emulator written in JavaScript. It currently supports all 151 opcodes for the original 6502 CPU, high-resolution graphics mode, full-screen text mode, keyboard input, and a disassembler.

It's not complete and still has bugs, but you can boot and play games, including Spy's Demise.


You'll need ROM files to use AppleToo (you can find ROMs pretty easily with a little Googling).

Your own machine code

Here's a minimal program, that just paints some dots in hi-res graphics. Paste a9558d3c22 into the Data field, c000 into program counter, and then Run.


You’ll need CodeMirror to use the disassembler.

git clone
cd CodeMirror
npm build


  • Finish disk controller
  • Audio
  • Implement other graphics and text modes (low-res, mixed, etc)
  • 65C02 opcodes


  • Nicholas Bergson-Shilcock
  • Steve Ciraolo
  • Amy Dyer
  • Sam Epstein
  • Sarah Gonzalez
  • Nathan Hoffman
  • Nathan Michalov
  • Sidney San Martín
  • Raph Levien


Copyright (C) 2012 Hacker School

Distributed under the terms of the GNU General Public License version 3.